—14— 



Quite inseparable from Weisia viridula as to the vegetative organs and 

 differing only by the capsule closed with a membrane finally perforated in 

 the center. 



Weisia Wimineriana B. & S., Bryol. Eu. 33-36:4, pi. i. {Gymnostomum 

 Wimineriana Sendt. in Flora 23:59. 1840. Hymenostomum murale Spr. 

 Muse. Pyr. No. 236. Gy7nnostomum murale Sch. Syn. 37. i860. [Ed. i.]. 

 Minnesota: Taylor's Falls (J. M. Holzinger, 1895). 



Resembling the slender forms of W. viridula in size, habit, shape, and 

 areolation of the leaves ; distinct chiefly by the inflorescence, which is paro- 

 icous or sometimes as in our Minnesota specimens, synoicous. The teeth 

 are rather perfect, with 4-5 articulations. 

 Grimmia sucsulcata Limpr., Laubm. 1:757. 



Idaho (J. B, Leiberg, 1892; J. H. Sandberg, 1883. Northwestern 

 Montana: in the vicinity of Lake MacDonald, Flathead County (J. M. 

 Holzinger and J. B. Blake, 1888), 



A long time confused with G. alpestris Schleich. The distinctive char- 

 acters quoted by Limpricht are: for G. alpestris, ^QdiiQ,€\. straight, capsule 

 without stomata, leaves not plicate ; and for G. subsulcata, pedical somewhat 

 curved, capsule with stomata, leaves with two longitudinal folds in the upper 

 part. The last character is the best, for the pedical of G. subsulcata is some- 

 times nearly straight and the capsule without stomata, while the folds of the 

 leaves are always distinct, especially on a transverse section. 



It is to be noticed the Limpricht cites erroneously G. lamellosa C. Miill. 

 as a synonym for G. alpestris: on the contrary, from an original specimen 

 Miillers plant is proved identical with G. subsulcata. The true G. alpestris 

 Schliech. has been gathered by Messrs. J. M. Holzinger and B. Blake in the 

 same region of Northwestern Montana where they have collected G. subsul- 

 cata. 



Orthotrichum Idahense Card. & Ther. 



Monoicous, in loose depressed cushions, fuscous below, yellowish- 

 green above. Stem decumbent at the base, leafless for some dis- 

 tance, irregularly branching, 2-3cm. high, branches ascending. Leaves 

 erecto-patent when wet, erecto-appressed when dry. 1.75-2. 05mm. long, 

 0.50-0.75 broad, oblong lanceolate, subobtuse, entire, margins revolule 

 from near the base to below the apex, costa subpercurrent ; cells 

 unistratose throughout, strongly incrassate, rectangular below, linear 

 next to the costa, quadrate or short-oblong towards the margin, the rest 

 round, covered on both sides with thick bi — or trifurcate papillae. Peri- 

 chaetial leaves closely resembling the leaves but arelation laxer at base. 

 Vaginule bare. Capsule scarcely emergent on a very short seta or semi- 

 emergent, ovate when moist, tapered to a short neck, sub-cylindrical when 

 dry, slightly constricted below the mouth, eight striate, the strias of four rows 

 of longer yellowish cells with thicker walls; stoma superficial. Operculum 

 unknown. Teeth of the peristome eight bigeminate, or sixteen, reflexedwhen 

 dry, more or less perforated, minutely granulous, linear above ; cilia none 



